Enter the AL value (inductance factor) and the number of turns of the inductor into the calculator to determine the inductance of the ferrite inductor.
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Ferrite Inductor Formula
The following equation is used to calculate the ferrite inductor inductance from the core’s inductance factor (AL) and the number of turns.
L = A_L \cdot N^2
- Where L is the inductance (H)
- AL is the inductance factor of the ferrite core (H/turn², often specified as nH/turn² by manufacturers)
- N is the number of turns on the ferrite core
To calculate the inductance of a ferrite inductor, multiply AL by the square of the number of turns.
What is a Ferrite Inductor?
Definition:
Ferrite inductors are a type of inductor known for strong electromagnetic properties. These inductors have a ferrite core that provides them with low electrical conductivity (high resistivity) compared to metallic cores, which helps reduce eddy-current losses.
How to Calculate Inductance of Ferrite Inductor?
Example Problem:
The following example outlines the steps and information needed to calculate the inductance of a ferrite inductor.
First, determine the AL value (inductance factor). This value is typically provided by the core manufacturer (often in nH/turn²). For this problem, assume AL = 50 nH/turn².
Next, determine the number of turns of the inductor. In this example, the number of turns is 30.
Finally, calculate the ferrite inductor inductance using the formula above:
L = AL × N²
L = 50 nH/turn² × (30)²
L = 50 × 900 nH = 45,000 nH = 45 μH
